/* ORION history — hybrid theme.
   Reading pages: local-history exhibit (newsprint/archival).
   Accents: amber phosphor, 1994 logo star field.
   Era panels: FreePort (1994–95) and Lynx (1995–99) screens.
   No web fonts, no JS required. Works in Lynx. */

:root {
  --paper: #f4efe4;
  --paper-2: #ebe3d2;
  --ink: #1d1b17;
  --muted: #5a5246;
  --rule: #c9bda6;
  --accent: #8a4f00;      /* amber, AA on paper */
  --link: #6b3d00;
  --night: #0d1424;       /* logo star field */
  --phosphor: #ffb000;    /* amber terminal */
  --phosphor-dim: #c88a00;
  --term-bg: #120d05;
  --serif: Charter, "Bitstream Charter", "Iowan Old Style", Georgia, serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --measure: 40rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #17130d;
    --paper-2: #211b12;
    --ink: #ece3d0;
    --muted: #b3a68e;
    --rule: #3d3424;
    --accent: #ffb000;
    --link: #ffc54d;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { font-size: 112.5%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

a { color: var(--link); text-underline-offset: 0.15em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: var(--paper); padding: .5rem 1rem;
}
.skip:focus { left: 0; z-index: 10; }

/* ---------- Masthead: star field + amber wordmark ---------- */
.masthead {
  background-color: var(--night);
  background-image:
    radial-gradient(1px 1px at 12% 30%, #fff8 50%, transparent 51%),
    radial-gradient(1px 1px at 27% 70%, #fff6 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 41% 22%, #fffc 50%, transparent 51%),
    radial-gradient(1px 1px at 58% 64%, #fff7 50%, transparent 51%),
    radial-gradient(1px 1px at 66% 18%, #fff5 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 79% 48%, #fffb 50%, transparent 51%),
    radial-gradient(1px 1px at 88% 80%, #fff6 50%, transparent 51%),
    radial-gradient(1px 1px at 94% 26%, #fff8 50%, transparent 51%),
    radial-gradient(1px 1px at 6% 84%, #fff5 50%, transparent 51%),
    radial-gradient(1px 1px at 35% 90%, #fff4 50%, transparent 51%);
  color: #e8e2d4;
  border-bottom: 4px solid var(--phosphor);
}
.masthead .inner {
  max-width: 64rem; margin: 0 auto; padding: 1.25rem 1.25rem 1rem;
  display: flex; flex-wrap: wrap; align-items: baseline; gap: .25rem 1.5rem;
}
.wordmark {
  font-family: var(--mono); font-weight: 700; letter-spacing: .35em;
  font-size: 1.6rem; color: var(--phosphor); text-decoration: none;
  text-shadow: 0 0 6px #ffb00066;
}
.wordmark small {
  display: block; letter-spacing: .12em; font-size: .62rem; font-weight: 400;
  color: #cfc6b2; margin-top: .2rem;
}
.masthead nav { margin-left: auto; font-family: var(--mono); font-size: .8rem; }
.masthead nav a { color: #e8e2d4; margin-left: 1rem; }
.masthead nav a[aria-current] { color: var(--phosphor); }

/* ---------- Reading layout ---------- */
main { max-width: var(--measure); margin: 0 auto; padding: 2rem 1.25rem 4rem; }
main.wide { max-width: 64rem; }

.kicker {
  font-family: var(--mono); font-size: .8rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--accent); margin: 0 0 .5rem;
}
h1 { font-size: 2.2rem; line-height: 1.15; margin: 0 0 .75rem; font-weight: 700; }
h2 {
  font-size: 1.35rem; margin: 2.5rem 0 .75rem; padding-top: 1rem;
  border-top: 1px solid var(--rule);
}
h3 { font-size: 1.05rem; margin: 1.75rem 0 .5rem; }
.dek { font-size: 1.15rem; color: var(--muted); margin: 0 0 2rem; font-style: italic; }

time, .date, .mono { font-family: var(--mono); font-size: .88em; }

blockquote {
  margin: 1.5rem 0; padding: .25rem 0 .25rem 1.25rem;
  border-left: 4px solid var(--accent); font-size: 1.1rem;
}
blockquote footer { font-size: .85rem; color: var(--muted); margin-top: .25rem; }

sup a { text-decoration: none; font-family: var(--mono); font-size: .75em; }

/* Asides: memories, facts, try-it */
.aside {
  background: var(--paper-2); border: 1px solid var(--rule);
  padding: 1rem 1.25rem; margin: 2rem 0; border-radius: 2px;
}
.aside > :first-child { margin-top: 0; }
.aside > :last-child { margin-bottom: 0; }
.aside .label {
  font-family: var(--mono); font-size: .75rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--accent); display: block; margin-bottom: .35rem;
}
.memory { border-left: 4px solid var(--accent); }

/* Try-it card links into the toy */
.tryit {
  display: block; margin: 2rem 0; padding: 1rem 1.25rem;
  background: var(--term-bg); color: var(--phosphor);
  font-family: var(--mono); text-decoration: none; border-radius: 4px;
  border: 1px solid var(--phosphor-dim);
}
.tryit:hover, .tryit:focus-visible { box-shadow: 0 0 0 2px var(--phosphor), 0 0 18px #ffb00044; }
.tryit strong { display: block; font-size: 1rem; }
.tryit span { color: #e0c48a; font-size: .85rem; }

/* Fact strip */
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: 1rem; margin: 2rem 0; padding: 0; list-style: none; }
.facts li { border-top: 3px solid var(--accent); padding-top: .5rem; }
.facts b { display: block; font-family: var(--mono); font-size: 1.4rem; }
.facts span { font-size: .85rem; color: var(--muted); }

/* ---------- Era screens ---------- */
.screen {
  margin: 2rem 0; border-radius: 6px; overflow: hidden;
  border: 10px solid #d9d0bc; border-bottom-width: 18px;   /* beige WY-60-ish bezel */
  box-shadow: 0 2px 0 #b8ad95, 0 6px 18px #0003;
}
.screen pre {
  margin: 0; padding: 1rem 1.1rem; overflow-x: auto;
  background: var(--term-bg); color: var(--phosphor);
  font-family: var(--mono); font-size: .78rem; line-height: 1.45;
  text-shadow: 0 0 4px #ffb00055;
}
.screen figcaption {
  background: #d9d0bc; color: #3a342a; font-size: .8rem; padding: .35rem .6rem 0;
  font-family: var(--serif);
}
.era-lynx .screen pre { color: #d8d8d8; text-shadow: none; background: #000; }
.era-lynx .screen pre .lnk { color: #ffd75f; }
.era-lynx .screen pre .sel { background: #3a5f86; color: #fff; }

/* ---------- Chapter index ---------- */
.chapters { list-style: none; padding: 0; margin: 1.5rem 0; }
.chapters li {
  display: grid; grid-template-columns: 7.5rem 1fr; gap: 1rem;
  padding: 1rem 0; border-top: 1px solid var(--rule);
}
.chapters .yrs { font-family: var(--mono); color: var(--accent); font-size: .9rem; padding-top: .2rem; }
.chapters h3 { margin: 0 0 .25rem; font-size: 1.1rem; }
.chapters p { margin: 0; color: var(--muted); font-size: .95rem; }
.chapters .soon { font-family: var(--mono); font-size: .75rem; color: var(--muted); }
@media (max-width: 36rem) { .chapters li { grid-template-columns: 1fr; gap: .25rem; } }

.pager { display: flex; justify-content: space-between; gap: 1rem;
  margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--rule);
  font-family: var(--mono); font-size: .85rem; }

.sources { font-size: .85rem; color: var(--muted); }
.sources ol { padding-left: 1.5rem; }
.sources li { margin-bottom: .4rem; }

footer.site {
  border-top: 1px solid var(--rule); color: var(--muted);
  font-size: .8rem; text-align: center; padding: 1.5rem 1rem 2.5rem;
}

.cursor::after { content: "\2588"; margin-left: .15em; animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .cursor::after { animation: none; } }

@media print {
  .masthead, .tryit, .pager, footer.site { display: none; }
  body { background: #fff; color: #000; }
}

/* Let 80-column screens break out of the reading measure on wide viewports */
@media (min-width: 54rem) {
  .screen { margin-left: -5rem; margin-right: -5rem; }
}

/* Call for memories: marks a gap we'd like readers to fill */
.cta {
  margin: 2rem 0; padding: 1rem 1.25rem;
  border: 2px dashed var(--accent); border-radius: 4px;
  background: transparent;
}
.cta .label {
  font-family: var(--mono); font-size: .75rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--accent); display: block; margin-bottom: .35rem;
}
.cta p { margin: 0 0 .5rem; }
.cta a.go { font-family: var(--mono); font-size: .85rem; }

/* Simple dated timeline list */
.timeline { list-style: none; padding: 0; margin: 1.5rem 0; }
.timeline li { display: grid; grid-template-columns: 7rem 1fr; gap: .75rem; padding: .45rem 0; border-top: 1px dotted var(--rule); }
.timeline time { color: var(--accent); }
@media (max-width: 36rem) { .timeline li { grid-template-columns: 1fr; gap: 0; } }

/* 1998 ISP "phone book" exhibit */
.phonebook { margin: 2rem 0; border: 1px solid var(--rule); background: var(--paper-2); }
.phonebook caption {
  caption-side: top; text-align: left; padding: .75rem 1rem .5rem;
  font-family: var(--mono); font-size: .8rem; letter-spacing: .08em; text-transform: uppercase; color: var(--accent);
}
.phonebook table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.phonebook th, .phonebook td { text-align: left; padding: .35rem 1rem; border-top: 1px dotted var(--rule); vertical-align: top; }
.phonebook th[scope=col] { font-family: var(--mono); font-size: .75rem; color: var(--muted); font-weight: 400; border-top: 0; }
.phonebook td.num, .phonebook th.num { font-family: var(--mono); white-space: nowrap; }
.phonebook tr.orion td, .phonebook tr.orion th { color: var(--accent); font-weight: 700; }
.table-scroll { overflow-x: auto; }

/* Speed ladder */
.ladder { list-style: none; padding: 0; margin: 1.5rem 0; font-family: var(--mono); font-size: .85rem; }
.ladder li { display: grid; grid-template-columns: 3.5rem 1fr 6rem; gap: .75rem; align-items: center; padding: .2rem 0; }
.ladder .bar { height: .7rem; background: var(--accent); border-radius: 1px; }
.ladder .v { text-align: right; }

/* Share-a-memory form */
.memory-form { margin: 1.5rem 0 2rem; }
.memory-form .field { margin: 0 0 1.4rem; padding: 0; border: 0; }
.memory-form label, .memory-form legend { display: block; font-weight: 700; margin-bottom: .3rem; }
.memory-form .req { font-weight: 400; color: var(--muted); font-size: .9em; }
.memory-form .hint { margin: 0 0 .4rem; font-size: .88rem; color: var(--muted); }
.memory-form input[type=text], .memory-form input[type=email], .memory-form textarea {
  width: 100%; font: inherit; color: var(--ink); background: var(--paper-2);
  border: 1px solid var(--rule); border-radius: 3px; padding: .55rem .65rem;
}
.memory-form textarea { font-family: var(--mono); font-size: .9rem; line-height: 1.5; resize: vertical; }
.memory-form input:focus-visible, .memory-form textarea:focus-visible { outline: 3px solid var(--accent); outline-offset: 1px; }
.memory-form .checks { display: flex; flex-wrap: wrap; gap: .35rem 1.25rem; }
.memory-form .checks label, .memory-form label.inline { font-weight: 400; display: inline-flex; gap: .4rem; align-items: center; margin: .2rem 0; }
.memory-form input[type=checkbox], .memory-form input[type=radio] { width: 1.1rem; height: 1.1rem; accent-color: var(--accent); }
.memory-form .hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.memory-form .send {
  font-family: var(--mono); font-size: .95rem; letter-spacing: .05em; cursor: pointer;
  background: var(--term-bg); color: var(--phosphor); border: 1px solid var(--phosphor-dim);
  border-radius: 4px; padding: .7rem 1.4rem;
}
.memory-form .send:hover, .memory-form .send:focus-visible { box-shadow: 0 0 0 2px var(--phosphor), 0 0 14px #ffb00044; }
.memory-form .send[disabled] { opacity: .6; cursor: progress; }
.form-status { min-height: 1.5em; font-weight: 700; color: var(--accent); }
.form-status.bad { color: #b3261e; }
@media (prefers-color-scheme: dark) { .form-status.bad { color: #ff8a80; } }

.screen figcaption a { color: #5a3300; }
.screen pre:focus-visible { outline: 3px solid var(--phosphor); outline-offset: -3px; }